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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd765968eab86347eb410034906232cb0e80cd947780d45680bf4e4df68f351f9' 
  AND token = 'BXXxO3+nU/2qc6Nd39kjiCZOuwsFKfKh45X1CxlE7Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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