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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f02be01b279947cea552fd833aadf8b0caec395f76cbbb62a55d07b4ee0d09' 
  AND token = 'BH38K/u4LBOOrbQtcDKDOP8sz+tz51EBY7ca3Y/HG7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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