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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd373e4693a4e8e54808f089611d189a5a14a8b6e2e6de84ab8a4f94ac27ba2' 
  AND token = 'iX+cg5a41lakmk3MaOAVFzmNxteZon3B1ZIW0WG+mLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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