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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9211000d3d3ae56a6e778f8cd219ccec3ec099f1c0f8c7a0cae0aea4cf3dcf62' 
  AND token = 'dtg7QZ8qrnbweJimuXLqLkW0v4ueUp17VFONeivQgQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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