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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4267990fd428434dea265a4b496e8467aeff8858a0859eb450ef2aa3c95e8a34' 
  AND token = 'BNJlnB1FzZKnebWn8jNsHd1rL1tYXwUOQNZwOUy6SW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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