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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb08d2ffbf01d4774d3feef0e31a151fadb287c5411e9453b8d4b17d5de82ecc' 
  AND token = 'EPecVVpaOl8C43BQ1wXo2QxztRQ6UfHKk8HcoZkn8dU=' 
  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"
    }
  }
}