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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff047f3872f948b4a860b9a5d1554e4f17953fdc3d7663293bc9b0ec86d5b56b' 
  AND token = 'L8T3GOOzFFroOSCTwCcLjwkVhbdLME2niTsK9f8VVes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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