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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87becb7cd81fd92d3f9f2a6a86b475bbfe1fa20e00ff3c265a0444ff1c2c2850' 
  AND token = 'A4OukgMwsw8PrKr+0VMeWrpoIsVnJNdLu1N6kJav0rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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