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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6220be39e190b15cbc395c42582831c30c67d9d882ba3b4fc388d806bf4011' 
  AND token = 'y2Zv3dnYIoekWasU9JIw6Em2/fSDQmo+slmNFdqcXaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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