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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42783d1865e5afeaeab3751c3cd945e7f54e17c85764fe0033846225a8a66efb' 
  AND token = 'UWGx3zTyIFmbh3wlqJGTDUPs1H2V6s1K8FDiqMt9oT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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