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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5bfe8c1d114ecefc35a26cf942dc3b14c521244b04643bf88f1b639eab103ce' 
  AND token = 'JU1EzI4agkoeAClGhU5hCDVLAo4s9HLtbGi+lH6V5KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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