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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676388e4793261d402714ed025b1cdad51f904a9dd8a784e1b2c8285bd605d8a' 
  AND token = '5VV2GY//MRTUH3ePgExJmof8XbaG+ISiLa9d+jJJeLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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