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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99be6e432fd65ebda7ed1f457bb0469cb49de62c5aa52a716e7068a9eac79592' 
  AND token = 'pkXkqWZHAvWt/uqUd3nUVuyg/4qmI0STZgsNtVAV9bA=' 
  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"
    }
  }
}