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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5929343c0dfe32261c3986712e3eb997b58cf3f724c0a01e583b855ced859073' 
  AND token = 'vQTPo6mi64g4mxxEXSdSxBe3dZ/GJzalZQdu21SZ6jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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