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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e66840e8a0eaa4dfe4b5fd06fd969cb043ddc31e821b7481bb96b1697c253e1f' 
  AND token = 'aZMWFOLqfa1Ptnef3IvNZV4oGIP+KN5IWwIU4KfO7Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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