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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ade507fd228647a9b2e14f6173b0a4a86c3850c405e1c1ad0c46d54ff726da' 
  AND token = 'g5Na2wgOIupPsY9UZBbaoXAkiHT2Npk5a0pQkf7l1+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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