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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '106673e4499e87b3e1cf9fde73a1654d48f807bb35de209985e34cb123ae4819' 
  AND token = 'J3cgdVOA0yy66qblTc7hu09JXHRwCy/YLzamn/1x2F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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