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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a80fb1696e4b1312225e83ae8eafc1d264d7a23133d19d485f56b7edcc73983' 
  AND token = '9jQwqbet7asCX+michtkiszmRi0ZJOBPRSx93srbm5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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