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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb9d2e5b73c5773997fd0bff3902e5ba33d2e491f17ad5920933f4d4c7597599' 
  AND token = 'mILaFCEjP46I2ItxS1gGnQh6wBZaBbq36AAqTUuwUkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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