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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f624d873e55c7c98e19b7667f58038f206ae910c94d2caa01b9150efa4ceb59' 
  AND token = 'LoYzm6F/Zij03NhgNMoBbo9Nw8U1QSqrwM1DdGrX15I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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