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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1968481280e1b753987181f866026161a238ea1d2f4d76bc58c13ef5bed3a091' 
  AND token = 'KIHUwIqOPrpRS+25oXGiiYUs6q7OMDpa2oRag3urYV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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