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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5024d75f9782a1bd7a0a311ab76f5485b41f2b8b9e523e70ccde66aaee7038b' 
  AND token = '4gZpubCP4ypv58qUOjeviWMmI14Z7k7GMdOk0kS0ajs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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