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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735750a0614a4e9829fc84b0908c9c1058860f2ccac274801c9ad49e2eb832ae' 
  AND token = 'gE6HsgHftzViQYY43rM2kWJVKKuGtb5dLbmE2J6jPkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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