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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b8d22cf06efd817cc8f49153bb0d0e57d7e991070797f4e71c723d5a4b4a3b' 
  AND token = 'ZD8AXDEs0C67JMioUxhHYasvf49Bl6b6Loa2kHsi+D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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