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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4886188517ead1a38e838a51e27edcea98e6969b6a5e4189aa021999c98a1b74' 
  AND token = 'yXUaydz0w+1JE7V12EUC3MOVDEDN3jFsH9Utu4T0gOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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