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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51b2f99f4ae90a9b892b9853abaf860bf32eaddc197e29bf4a3f039765d0abbd' 
  AND token = 'g/RsUgBbgCsksQh3J4f4djXWzcJi5hFHegWuAfwV3Zs=' 
  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"
    }
  }
}