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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30a1bb5ade438a464dd4f4789f60fd1b619c25457f33705d453c5cc094cb5b6' 
  AND token = 'ASsDgL3ceJGZ4U22UIGORTvzm5bPKDVZYm0WAYbE5fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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