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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509e08772e7c481bdb2533e8a3fe4af37b48d195da37a5c00728fff19d2f0aea' 
  AND token = 'sU64i73srQBQ9yG8vUGeYXrEy1jsF7pU71CdhsQet2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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