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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c71d98943d6946c0845f8f93976b78ad640b8985dc01c2fb576f5e35a204a2' 
  AND token = 'tMjP1gUCxW2c8o4qFps36BB2Rn3cj8woqHB6vacx12g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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