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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6dd8be5da25af095a1641f8b436c937448889ea51c051705242f5723bc6a4d' 
  AND token = 'is2xDJTN0HhUW3IIiNVuUy49U9qTCoX2K1GN41z6n1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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