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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3768b687b5febf5858a3c589978b0af970ef707c5791ca1d153defd59238c6d' 
  AND token = 'dUC47xbiNND6/LO7jCOS9JM+QDPgrCr/jIPESPXdh5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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