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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d919d2a1721e74222fa943bbdba99f64f19f9f3e519b388fad0729b7cd7eec' 
  AND token = '7Bl19hKQgGJ1lijsQ6WgDnhpX7acJ46mejKNGQdFII0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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