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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6e07527360594230400f8a528a1a9e3600e479a9e359f52ac64d9cda83893f' 
  AND token = '0aRDTm6omae7yqEDWPW501JmxlMF2126+h+cj/IMthk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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