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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6364c65f4c51e4e7d95eef83a17d8eafb13ce9e65e606d5594cc6adee3eea88a' 
  AND token = '7g8az97/X/9SJHVPVkLdsGze11SiwhOjwG4vYxW68mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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