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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4638085435ea8f18a9577a4b84f40c613021db4c5a1677c7408756ea703c7f5a' 
  AND token = 'jce1qjVreWxX3M6pi6aiHZl0Wv9F8AclG+enn5K8I5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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