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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7abf072b17f6dd5a45780a5a2999383f4f496101d0cb51de7b00f824f990b54f' 
  AND token = '8XIT6Q3Waxu14f1mQmnmBxeHKfneH9B46emmiA+3vBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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