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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0f380a88071fd69ba6d64887b967b0f0b4c034a78ca7242ac4dbcb39fcf2b6' 
  AND token = 'xeyz+m9IZ69IcSx0G/lvSFBwIsWlS628MkiQB+wqziQ=' 
  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"
    }
  }
}