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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c90f17115fd7ca47b94f82e96ee31d7a548d5dce894394a9b73ca8eae5394e' 
  AND token = 'gnLhPWOW3d+S0PPyts6kQLnq6DMGSH8T6C+jcka5hbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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