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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7958b92d8b2cec7707db1419235b7c67394e651de00a084beab75bf5c98d9f9a' 
  AND token = 'P/hhr0InEmsw3BXRKBJpXEEVQoXeUxDpGqx9ygc8Rdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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