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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '001c156f9608a352f5b8c8c86a243394fbb5314def771021f768630efaa399ec' 
  AND token = '5DG3X96mpDuozsYM0L/mntJNbyiDd90dLRffV1lfkL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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