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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ac0f9064b2230fe2a7eefa1d49d6a90a8d90ced2886ab586ecf6e752ec222c' 
  AND token = 'XpeQkqq8UPYKGuS3PKnUjKSDrl4ATOnX9o/VeWwxaL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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