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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c9d029d0ead1d41b56304654d74e07558560963d3d9849519c4104d7bb585a' 
  AND token = '0XL+cGzt29+eluYKh0mLyRu/Sm/a44mp0hDmUEUO0Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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