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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d55ec7ae0be1b4c6788abd25e10a755ade997f95a33e2013a17291287f15b65' 
  AND token = '5I53DvD8IeSqxVySBsmUTSsWQcbKp/cnIaJ8Nbi5gTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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