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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f65a027f3478b175e29ffd79b6ff555fae199275e7837ec5a9702970022656c' 
  AND token = 'qiNYsOClohUIf61dNrV+Y5iQMI8a8FSMDSR1dV3v3NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}