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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d7805f64e79d62f9c46ff0aa2255ba7fd85a8bb8911f37a27bf9be06bd6de6' 
  AND token = 'DmBH2D5e5KZhR2YEbp3y55OqXrNuGyPVxubYDKC+l2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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