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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a8b02caff52c0c4232843808cf9ebf5e8550b9e5ff645f46c26139a2f88dc88' 
  AND token = 'oBTSAxFhCM5iqaRJj/d6BhMGlaXQD7IwAEeCoU5kE3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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