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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e3d714e4e1220439e8df50d41e7f682f8e2881e22dfa1105b4f103a655fbc0' 
  AND token = 'qHZ8LgJUwT9QVDM3dlZc/Sz93ASGS4GULHMIX1TD0xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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