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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89620d890a55c3a4f4173714496909a8f0e9c475b1b046c6bc7cd3c9bd86c430' 
  AND token = '96W2LlwZA8na+tJmzkYVzUwGxCbuqUY507YdS2s4CSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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