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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e57643d07b95a9e3a45b8ca56dbdc401feb507bbafc45c372cba15c17cbf5f7a' 
  AND token = '7K+jSekNfj+MzRnuCD0/TKmp8dy8QA1Chyr3uifJw9Y=' 
  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"
    }
  }
}