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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b10deb457ba5edf7afa622631b26dd6cb3eb4a7af88ef2bc0a25ebd204a8fe8' 
  AND token = 'Ll4cGtLYO/BeqlSl8x4gPjtuCCtEimkY16PaYvi4arw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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