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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60adf3964fb48a68bdcf0a9c840d132cedce5c16d52905698e4b762e84262bb2' 
  AND token = 'gTVvbuDMmiZxeHUBAnNhw3mX/W1zWV93y8bkwUcyTCg=' 
  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"
    }
  }
}