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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616aa5ba2a71fad1dd4b5408ac770576fcc4056f36770e43c6c72e6c68258d60' 
  AND token = 'suqmsfKcUFqKwZpOTg2xxHFA99WyRfgiVB9mZ2U7dKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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