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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b68880f07e692cf3f2891fb1df4758909e56b821000629b05bd6381b18172c0' 
  AND token = 'hzAKztC7XRi6/nNA2m6p472JfI5H1j6wdbIzqnifRIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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