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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b72a83f397108827b4b50d5845aaa3f4fabbd340511dc1604ed2ad722042fd' 
  AND token = 'IdAJ0OthPX0vsGGZv+eNCK2i1OKJQo8D0h15wu4InSc=' 
  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"
    }
  }
}