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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b848853bc1b285320c96e7c19a5f6355bd8ff21c60b069b4f0e90530f2ad1e1' 
  AND token = 'lL4qL52852kZYICQfb6/54kXmvB1lhEUTnPwyJrzkf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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