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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a5401ced702d4ddf1cadd82c9c82da58df2f0f3e6c74561a91c5a666951676' 
  AND token = 'Q/DQZenjzn5Utz9C4dSVP6lwNa8oAC6KoIGYiBL7Zqo=' 
  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"
    }
  }
}