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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669f813b80b21d6f30e77da8a887d256d1dd2231c19fcba2729c56e0c01b0b84' 
  AND token = '0lcsZbHlO3Slr12CFcQg4uS67zI/7yN/slEHRRyq8fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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