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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531ce34125e6eb128dc7a91bd37f68c40be296a61dff790de118c0d6b5abf5ec' 
  AND token = 'sPpACeB+UmtGzk+ysA1gqSEEhLUikrTVKw28r8Ed3iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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