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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9458adde541cb33df8d256a66c4f4b6024be50746a093a42c9d1ec27aa8a4ade' 
  AND token = 'PqY86JG2qnQTbfCn9LWUEsmUltPguhbEvQiVG37Wi8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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